Postural control and sensory integration in cervical dystonia

Vacherot, F.; Vaugoyeau, Marianne; Mallau, Sophie; Soulayrol, S.; Assaïante, Christine; Azulay, Jean‐Philippe

doi:10.1016/j.clinph.2007.01.013

Cited by 18 publications

(9 citation statements)

References 37 publications

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“…Alterations in sensory integration which have been demonstrated in subjects with dystonia [30] and impaired vestibular reflexes [30,31] may be alternative explanations for the postural instability. However, postural control of cervical dystonia patients was found to be very similar to that of control subjects [33]. …”

Section: Discussionmentioning

confidence: 99%

Clinical and neurophysiological improvement of SGCE myoclonus–dystonia with GPi deep brain stimulation

Kurtis

Luciano

et al. 2010

Clinical Neurology and Neurosurgery

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Myoclonus-dystonia (M-D) is characterized by early onset myoclonus and dystonia. It is thought to be subcortical in origin. Response to oral medications may be incomplete, such that deep brain stimulation (DBS) surgery to the globus pallidum interna (GPi) or ventral intermediate thalamic nucleus (VIM) may be considered. The optimal site is not known. The physiology and surgical response for a 63 year-old woman who underwent GPi DBS for M-D with onset at age 2 and related © 2009 Elsevier B.V. All rights reserved.Correspondence to: Rachel Saunders-Pullman. Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. NIH Public Access Author ManuscriptClin Neurol Neurosurg. Author manuscript; available in PMC 2011 February 1. to a mutation in the epsilon-sarcoglycan gene (SGCE) is described. She showed excellent clinical and neurophysiological improvement of both myoclonus and dystonia, suggesting that modulation by DBS is effective even after long disease duration and only partial response to oral medications.

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Section: Discussionmentioning

confidence: 99%

Clinical and neurophysiological improvement of SGCE myoclonus–dystonia with GPi deep brain stimulation

Kurtis

Luciano

et al. 2010

Clinical Neurology and Neurosurgery

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“…They had to maintain a vertical posture as steadily as possible, keeping their feet 15 cm apart without flexing their knees. A similar experimental set-up was successfully used in young adults [30] as well as in adults with Parkinson's disease [31] and cervical dystonia [32].…”

Section: Methodsmentioning

confidence: 99%

Postural Strategies and Sensory Integration: No Turning Point between Childhood and Adolescence

2010

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In this study, we investigated the sensory integration to postural control in children and adolescents from 5 to 15 years of age. We adopted the working hypothesis that considerable body changes occurring during these periods may lead subjects to under-use the information provided by the proprioceptive pathway and over-use other sensory systems such as vision to control their orientation and stabilize their body. It was proposed to determine which maturational differences may exist between the sensory integration used by children and adolescents in order to test the hypothesis that adolescence may constitute a specific phase in the development of postural control. This hypothesis was tested by applying an original protocol of slow oscillations below the detection threshold of the vestibular canal system, which mainly serves to mediate proprioceptive information, to the platform on which the subjects were standing. We highlighted the process of acquiring an accurate sensory and anatomical reference frame for functional movement. We asked children and adolescents to maintain a vertical stance while slow sinusoidal oscillations in the frontal plane were applied to the support at 0.01 Hz (below the detection threshold of the semicircular canal system) and at 0.06 Hz (above the detection threshold of the semicircular canal system) with their eyes either open or closed. This developmental study provided evidence that there are mild differences in the quality of sensory integration relative to postural control in children and adolescents. The results reported here confirmed the predominance of vision and the gradual mastery of somatosensory integration in postural control during a large period of ontogenesis including childhood and adolescence. The youngest as well as the oldest subjects adopted similar qualitative damping and segmental stabilization strategies that gradually improved with age without reaching an adult's level. Lastly, sensory reweighting for postural strategies as assessed by very slow support oscillations presents a linear development without any qualitative turning point between childhood and adolescence.

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“…In this case, it is likely imperative that the signal is somatosensory in nature and corresponds to the same somatotopic region as the dystonic musculature. Visual information or the touching of other body surfaces such as the opposite knee will not be helpful (Vacherot et al, 2007). It seems essential that the additional somatosensory stimulus activates similar or overlapping neural networks that process proprioceptive inputs within the same somatotopic regions of the somatosensory cortex and the basal ganglia.…”

Section: Why Do Sensory Tricks Reduce Symptoms In Dystonia?mentioning

confidence: 99%

Focal dystonia in musicians: linking motor symptoms to somatosensory dysfunction

Konczak¹,

Abbruzzese²

2013

Front. Hum. Neurosci.

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Musician's dystonia (MD) is a neurological motor disorder characterized by involuntary contractions of those muscles involved in the play of a musical instrument. It is task-specific and initially only impairs the voluntary control of highly practiced musical motor skills. MD can lead to a severe decrement in a musician's ability to perform. While the etiology and the neurological pathomechanism of the disease remain unknown, it is known that MD like others forms of focal dystonia is associated with somatosensory deficits, specifically a decreased precision of tactile and proprioceptive perception. The sensory component of the disease becomes also evident by the patients' use of “sensory tricks” such as touching dystonic muscles to alleviate motor symptoms. The central premise of this paper is that the motor symptoms of MD have a somatosensory origin and are not fully explained as a problem of motor execution. We outline how altered proprioceptive feedback ultimately leads to a loss of voluntary motor control and propose two scenarios that explain why sensory tricks are effective. They are effective, because the sensorimotor system either recruits neural resources normally involved in tactile-proprioceptive (sensory) integration, or utilizes a fully functioning motor efference copy mechanism to align experienced with expected sensory feedback. We argue that an enhanced understanding of how a primary sensory deficit interacts with mechanisms of sensorimotor integration in MD provides helpful insights for the design of more effective behavioral therapies.

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Postural control and sensory integration in cervical dystonia

Cited by 18 publications

References 37 publications

Clinical and neurophysiological improvement of SGCE myoclonus–dystonia with GPi deep brain stimulation

Clinical and neurophysiological improvement of SGCE myoclonus–dystonia with GPi deep brain stimulation

Postural Strategies and Sensory Integration: No Turning Point between Childhood and Adolescence

Focal dystonia in musicians: linking motor symptoms to somatosensory dysfunction

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